WIA GC/1896/6 | Cohen, [Otto?] to Warburg, Aby 26/11/1896 | Dr. Cohen has borrowed a book by Oscar Wilde from Professor [Emil?] Heilbut and, after having... |
WIA GC/1898/39 | Warburg, Aby to Juhl, Ernst [before 12/01/1898] | requests names and addresses of president of the Kunstverein in Hamburg in order to interest him... |
WIA GC/1902/280 | Loeb, James to Warburg, Aby 14/08/1902 | mentions Emil Heilbut (alias Hermann Helfferich), Ferdinand Noack, Georg Loeschcke; is interested... |
WIA GC/1912/474 | Warburg, Aby to Joachim, Hermann 20/02/1912 | he has not received the appeal for the foundation; possible contributors might also be Emil... |